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  • 1
    Electronic Resource
    Electronic Resource
    Acrosomal chromocentre in newt spermiogenesis (1975)
    [s.l.] : Nature Publishing Group
    Nature 257 (1975), S. 795-797 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Adult Triturus alpestris, T. cristatus and T. vulgaris were captured from their natural habitat near Ulm, southwestern Germany; T. marmoratus was caught in southern France (Banyuls-sur-Mer) and Diemyctilus viridescens was obtained from a dealer. Four hours before they were killed, the animals ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/257795a0
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic variability in the antCamponotus floridanus detected by multilocus DNA fingerprinting (1994)
    Springer
    Naturwissenschaften 81 (1994), S. 34-36 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01138560
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic Variability in the Ant Camponotus floridanus Detected by Multilocus DNA Fingerprinting (1994)
    Springer
    Naturwissenschaften 81 (1994), S. 34-36 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01138560
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  • 4
    Electronic Resource
    Electronic Resource
    Defect Analysis in SiO〈sub〉2〈/sub〉/Si Structures by Electron Tunneling (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 38-41 (Jan. 1991), p. 1331-1336 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/05/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.38-41.1331.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Mismatch dislocations caused by preferential sputtering of a platinum-nickel alloy surface (1992)
    Springer
    Applied physics 55 (1992), S. 468-475 
    Details
    ISSN: 1432-0630
    Keywords: 61.70.Jc ; 61.80.Jh ; 68.35.Dv ; 68.35.Fx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Preferential sputtering and recoil mixing of a Pt25Ni75(111) single crystal surface leads to platinum enrichment in the upper monolayers, thereby increasing the lattice constant in these layers. This results in subsurface lattice mismatch dislocations, which have been studied by scanning tunneling microscopy. While the subsurface dislocations are only visible as shallow ditches in STM topographs, the Burgers vectors of the dislocation system can be determined by means of atomically resolved images of dislocations reaching the surface. A comparison with simulations of lattice relaxation using embedded-atom potentials shows good agreement with STM data and further allows the determination of the thickness of the Pt enrichment. We have estimated the Pt concentration in these layers from the dislocation density and studied the annealing behaviour of the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348334
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  • 6
    Electronic Resource
    Electronic Resource
    Karyotype and chromosome banding in the reed frogHyperolius viridiflavus ommatostictus (Amphibia, Anura, Hyperoliidae) (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 509-511 
    Details
    ISSN: 1420-9071
    Keywords: Chromosome banding ; karyotype ; Hyperoliidae ; Ranidae ; Amphibia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary C-banding and mithramycin staining were used to characterize the karyotypes of 10 specimens of the African reed frogHyperolius viridiflavus ommatostictus from Tanzania. The diploid chromosome number is 2n=24. Although no heteromorphic sex chromosomes were present in the mitotic karyotypes, in many diakineses of male meiosis one or two bivalents exhibited an end-to-end arrangement. In the laboratory 7 out of 24 females changed sex spontaneously. This indicates that an XY/XX system of sex determination operates inH. viridiflavus ommatostictus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954249
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  • 7
    Electronic Resource
    Electronic Resource
    Karyotype and chromosome banding in the Turkish desert woodlouseDesertellio elongatus (Crustacea, Isopoda, Oniscidea) (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 339-341 
    Details
    ISSN: 1420-9071
    Keywords: Karyotype ; chromosome banding ; Desertellio elongatus ; Crustacea ; Isopoda ; Oniscidea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The karyotype ofD. elongatus was investigated by means of C-banding, silver staining, and mithramycin-and quinacrine fluorescent staining. The diploid chromosome number is 2n=50. C-banding shows pericentromerically localized constitutive heterochromatin in every chromosome. Two of the chromosome pairs carry two telomeric nucleolus organizer regions each. No heteromorphic sex chromosomes were found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923417
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  • 8
    Electronic Resource
    Electronic Resource
    Chromosome banding in amphibia (1992)
    Springer
    Chromosoma 101 (1992), S. 284-292 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A cytogenetic study performed on a population of the South American leptodactylid frog Eleutherodactylus maussi revealed multiple sex chromosomes of the X1X1X2X2♀/X1X2Y♂ (=XXAA♀/XXAY♂) type. The diploid chromosome number is 2n=36 in all females and 2n=35 in most males. The multiple sex chromosomes originated by a centric fusion between the original Y chromosome and a large autosome. In male meiosis the X1X2Y (=XXAY) multiple sex chromosomes form a classical trivalent configuration. E. maussi is the first species discovered in the class Amphibia that is distinguished by a system of multiple sex chromosomes. Only one single male was found in the population with 2n=36 chromosomes and lacking the Y-autosomal fusion. This karyotype (XYAA♂) is interpreted as the ancestral condition, preceding the occurrence of the Y-autosome fusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346007
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  • 9
    Electronic Resource
    Electronic Resource
    Chromosome banding in amphibia (1979)
    Springer
    Chromosoma 71 (1979), S. 29-55 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The distribution of constitutive heterochromatin on the chromosomes of Triturus a. alpestris, T. v. vulgaris and T. h. helveticus (Amphibia, Urodela) was investigated. Sex-specific chromosomes were determined in the karyotypes of T. a. alpestris (chromosomes 4) and T. v. vulgaris (chromosomes 5). The male animals have one heteromorphic chromosome pair, of which only one homologue displays heterochromatic telomeres in the long arms; the telomeres of the other homologue are euchromatic. This chromosome pair is always homomorphic and without telomeric heterochromatin in the female animals. There is a highly reduced crossing-over frequency between the heteromorphic chromosome arms in the male meiosis of T. a. alpestris; in T. v. vulgaris no crossing-over at all occurs between the heteromorphic chromosome arms. No heteromorphisms between the homologues exist on the corresponding lampbrush chromosomes of the female meiosis. In T. h. helveticus no sex-specific heteromorphism of the constitutive heterochromatin could be determined. The male animals of this species, however, already possess a chromosome pair with a greatly reduced frequency of chiasma-formation in the long arms. The C-band patterns and the pairing configurations of the sex-specific chromosomes in the male meiosis indicate an XX/XY-type of sex-determination for the three species. A revision of the literature about experimental interspecies hybridizations, gonadic structure of haploid and polyploid animals, and sex-linked genes yielded further evidence in favor of male heterogamety. The results moreover suggest that the heterochromatinization of the Y-chromosome was the primary step in the evolution of the sex chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00426365
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  • 10
    Electronic Resource
    Electronic Resource
    Chromosome banding in Amphibia. XV. Two types of Y chromosomes and heterochromatin hypervariabilty inGastrotheca pseustes (Anura, Hylidae) (1990)
    Springer
    Chromosoma 99 (1990), S. 413-423 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The chromosomes of the newly discovered South American marsupial frogGastrotheca pseustes were analyzed by conventional methods and by various banding techniques. This species is characterized by XY♂/XX♀ sex chromosomes and the existence of two different morphs of Y chromosomes. Whereas in type A males the XYA chromosomes are still homomorphic, in type B males the YB chromosome displays a large heterochromatic region at the long arm telomere which is absent in the X. In male meiosis, the homomorphic XYA chromosomes exhibit the same pairing configuration as the autosomal bivalents. On the other hand, the heteromorphic XYB chromosomes form a sex bivalent by pairing their short arm telomeres in a characteristic end-to-end arrangement. Analysis of the karyotypes by C-banding and DNA base pair-specific fluorochromes reveals enormous interindividual size variability of the autosomal heterochromatin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01726693
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